<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>  
</head>
<body>  
    <!-- 页面上的根标签 -->
    <div id="app">
        {{  message }}        
    </div> 
</body>
</html>
<!-- vue3 --- > ES6 -->
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
 <script>
    Vue.createApp({
        setup() {
            const message =  ('Hello vue!')
            return { message }
        }
    })
    .mount("#app"); 
 </script>
 

 